Improvement in boring-machine



for feeding it back.

eviten epopea, or nnencoMB, MAINE.'

` Letters Patent No. 97,280, dated November 30, 1869; antedatcd November 13, 1869.

XMPROVEMENT IN BORING-MACHINE.

l The Schedule referred to in these Letters Patent and making part ofthe same.

To all whom `it may concern:

Be it known that I, EVERD G. DODGE, of Edgecomb, in the county of Lincoln, and State of Maiale, have invented a new and improved Ship-Builders Anger; and I do hereby declare that the following is a full, clear, and exact description thereof', which will enable others skilled in the art to make and usc the same, reference being had to the accompanying drawings, forming a part of this specication.

Figure 1 represents a plan or top view of' my improved ship-bnilders auger. p

Figure 2 is a vertical longitudinal section ci' the same, taken on'the plane ofthe line aix, fig. 1.

Figure 3 is a detail under-side View of the apparatus Figure4 is a detail under-side view of the apparatus for clamping the device in any desired position.

Figures pand 6 are detail side'views of thc parts constituting the clamping-device.

Similar letters of reference indicate corresponding parts.

The invention consists in so constructing the teeth of atoothed bar, by interposing wedge-shaped bridges between them, that the sa-id bar will, when being moved longitudinally by the action of aclutched pinion, automatically throw the said pinion out of gear. Thel niotion of the said toothed bar willI thus be automatically stopped by its own action.

'lhe invention further consists in connecting the toolholder to the said toothed bar, and thereby also with the aforesaid pinion and with thej mechanism for driving the same, so that, by the rotary motion ofthe said pinion, the tool will be withdrawn after a hole of the desi-red depth has been bored.

A A, in the drawing, are two straight tubes, iu'which two parallel rods or bars B B areres'pectively fitted, 4

the outer or rear ends ot' the rod 4B being connected by means of a bar, C.

To the closedlfront ends of the tubes A. are respectively pivoted, by `means ot' pins a, wedge-shaped tingers or plates D D, and also bars E E, the outer upper ends of the said bars E heilig connected by means of a'rod, F. A

'Bhe pivoted portion of each plate D is bithrcatedso as totit around both sides, and the contiguous faces of the tubes A and their respective bars E are pro-` vided' with proiecting inclines b b, as shown in tigs. 4, 5, and 6. y f

By bringing the bars E at about rightangles to the tubes A, as in tig. 2, the farthest project-ing portions of their respective incliues b will be brought in contact with each other, whereby the forks of the plates D will be spread so as to clamp, by friction, the said fingers to the tubes or the tubes tothe fingers. V

The eudsot' the fingered) are to be inserted between two of tbe planks of the ship, in a crevice formed between them.

The tubes are then turned around their pivots a, so as to bring them into the desired position, and are then clamped in the .said position by turning up the frame E E F, as aforesaid.

The rods B B can be moved in or out of the tubes, so as to bring the rod C any desired distance away from the planks, and can then be clamped in the desired position by meansof screws c c, indicated in iig. 1.

It is evident, that instead of being tubes, the parts A may be rods or bars, iu which case B would be tubular, toallow the aforesaid lengthwise adjustment.

The part hereinbetoredescribed constitutes the frame of my improved auger.

The auger Gitself is fastened in a rotating holder, H, which has its bearings in a carriage, I, that slides and turns ou the bar C.

It will be seen from the above that the auger can thus vbe adjusted in various dilerent ways, viz, it can be turned into the desired direction around the pivots` (t or around the bar C; it can be longitudinally ad-' justed by means of the partsl, sliding in or on the parts A, and it can be laterally adjusted by sliding the carriage on the bar C. i

In this manner it is clear that holes can he bored through either one of a series ot'- planks, and through any part ot' one certain plank einlnaced between the fingers D.

The tool-holder H, having its bearings in the car riage I, can be rotated by means ot' a belt, d, which runs around a pulley, c, on a shaft, J, that has its. bearings in the carriage I, as shown.

The shaft J receives itsrotary motion either by hand or by suitable machinery.

The holder H may, however, in any other suitable manner be connected wit-h the shaft J.

The holder H turns also in lugs or ears f, that project from a toothed bar, K, which bar is thus suspended from the said holder.

It gears int-o a pinion, g, mounted on a sliding'slecve, la, which slides on a shaft, L, that has its bearings in the carriage.

The shat'tL is rotated by being connected either by means cfa belt, fi, or otherwise, with the shaft J, the shaft- L heilig at right angles to J, as shown.

The sleeve h can, by inea-iis ot' a le'ver, fi, which is pivoted to the carriage, be moved on the shaft L, so as to he coupled toa clntcl|,j, formed on the latter, as in lig. 3.

will be rotated by and with the shaft L, so as to cause sliding motion ofthe toothed bar K, and thereby also y When thus coupled,ithe sleeve hand its pinion g The position of the tool-holder having been ascertained and adjusted, the tool is brought against that spoton a plank Where the hole is to be bored.

The shaft J is then revolved, so as to turn the toolholder and the tool, and the latter will then bore the hole, feeding itself forward by the action of the screw formed on its end. y

During all this time the with the shaft L.

VVhenthe hole has been bored to the desired depth, the lever t is moved so as to throw the pinion in gear. The rotary motion of the lat-ter will then cause the toothed bar, and with it the tool-holder and tool, to slide back, and the tool will thereby be again withdrawn from the plank,

Between the innermost teeth of the bar K are formed tapering wedge-shaped bridges l Z, which, when the tool has been sufficient-ly withdrawn, come against the'side of the pinion or of any part of the sleeve h., so as to gradually throw the latter out of gear, to

pinion g was not in gear prevent further withdrawal and possible consequent breakage of either of the parts GH K.

t The holder H has a groove, fm, or is otherwise so arranged that it will turn with, but freely slide in a pulley, n, or its equivalent, by means of which it is connected with therotating shaft J.

instable frame B C, in combination with the tubes A, having the pivoted fingers D and bars E, substantially as described, for the purpose specified.

'3. The tool-holder H, in combination with the toothed bar K, having the wedge-shaped bridges I, formed between some of its teeth, and with the sliding clutch-pinion g, substantially as described, for the purpose specified.

EVERD C. DODGE.

X'Vitnesses:

J oHN ROBBINs, JOHN L. FosTEn.

2. The adjustable tool-holding carriage I, and ad- 

